Spatial Variability of Soil Water Properties and Its Volumetric Capacity in Hill Slope

Research to spatial variability of soil water properties was conducted with geo-statistical method in upland of the southwestern China. Results show that soil water properties have different spatial structure in different soil layers in our study area. They can be simulated with pure nugget effect model, linear model, exponential model and spherical model. The variable degree of the soil water properties is water contentwilting pointfield capacitysaturationbulk density. The coefficiency variance is among 1%~100%, which belong to moderate variability. Water properties are changing with the soil layers, but the semivariogram models have not apparent changing rule. The volumetric capacity of soil is available water-storagetransmission volumetric capacityunavailable volumetric capacity. Its spatial distribution is mainly affected by the soil layer thickness and terrain.